Compressor



Allg- 1933- A. A. H. TISSERANT 1,923,519

COMPRESSOR Filed Dec. 29, 1930 Patented Aug. 22, 1933 UNITED STATES1.923.519 comnusson Auguste Albert Honor Tisserant, St. Cloud, FranceApplication December 29, 1930, Serial No.

505,387, and in France December 30, 1929 20lalms.

The present invention is concerned with improvements in a fluidcompressor, of the type in which tightness between the cylinder and thepiston is assured by a metallic, annular membrane folded on itself inthe form of a bellows,

and secured at one of its extremities to the cylinder head and at itsother extremity to the piston head.

My invention will be hereinafter described in detail with reference tothe appended drawing, given merely by way of example, and which is anaxial sectional view of a preferred embodiment of my invention.

In the chamber of compression cylinder at the piston b is adapted toreciprocate. A metallic bellows 0, preferably made of brass, forms afiuidtight joint between the head 17 of piston b and the head a ofcylinder a. Said bellows is tightly held at its ends, on the one hand,at 0 29 between cylinder at and its head consisting of a plate a boltedon the cylinder, and at the other end, at 0 between the head b of pistonb and a cap-shaped piece 12, mounted on an axial teat b integral withthe head 11 of the piston, and maintained in position by means of a studd screwed in said teat b A nut d screwed on said stud d is adapted toreceive the thrust of a push rod e disposed along the axis of thecylinder and of the piston and adapted to slide in 30 a guide e integralwith the head a of cylinder at. The outer end e of said push rod e isacted upon by a cam f keyed on shaft f, suitably journalled in a bearingg which is provided in a prolonger part g. Said part 9 forms a casingfor push rod e and its driving mechanism, and is integral with the heada of the cylinder.

A spiral spring h screwed at its ends upon guide e of push rod e andupon cap (1, integral with the head of piston d, respectively, tendsconstantly to force said piston into its upper extreme position.

The compressor comprises inlet valve i, and outlet valve is, the firstof which is connected, through conduit to the source of fluid to becompressed, and the second, through conduit id, to the compressed fluidreservoir (not shown). A conduit i is branched to conduit i Saidconduit, which is provided in the wall of cylinder c, establishes acommunication through port i between inlet conduit i and auxiliarychamber 1 limited by the external face of the bellows 0, cylinder (1 andpiston b.

The operation of the device is as follows: The fluid to be compressed,admitted into cylinder 11 under piston 12 through conduit 2' and inletvalve 2, on the upward stroke of the piston produced by the contractionof spring h, is, on the following downward stroke of the piston,(produced by the action of push rod e upon the head of the piston) sent,after it has been compressed, past outlet valve is, through conduit kinto the reservoir provided for this purpose.

The left-hand part of the drawing shows the parts in their position atthe end of the downward stroke. The right-hand half shows the same partsin their position at the end of the outward stroke. During the downwardstroke of the piston, the volume of auxiliary chamber Z increases, andthe fluid to be compressed can enter, through inlet conduit i conduit iand port i into chamber Z. During the upward stroke of the piston on thecontrary, the volume of auxiliary chamber Z diminishes and the fluidpresent in said chamber is forced out, through port 2' and conduit iinto inlet conduit i It should be remarked that cylinder (1, piston 72,bellows 0, spring h, push rode and its guide e are all disposedconcentrically, whereby the compressor occupies a relatively smallspace.

The space 111. enclosed by bellows c is complete- 89 ly filled with oil,introduced into chamber n provided in casing g, which is integral withhead a of cylinder (1. Oil can thus circulate between chambers m and 12during the combined motions of membrane a and piston 22 and deaden thevibrations of the bellows.

It should be noticed that piston 11 is a true piston in the ordinarymeaning of the word adapted to perfectly fit the inner surface of thecylinder, so as to reduce the clearance space to 90 a minimum. Itsgas-tight fit against the walls of the cylinder can be obtained as aresult of the accuracy of its adjustment and through the intermediary ofelastic packings.

While I have disclosed what I deem to be the preferred form of mydevice, I do not wish to be limited thereto as there might be changesmade in the construction, disposition and form of the parts, withoutdeparting from the principle of my invention as comprehended within thescope of the appended claims.

What I claim is:

1. A compressor comprising in combination, a cylinder, a cylinder head,a hollow piston open within the cylinder reciprocable with a fluidtightfit therein, means for imparting a reciprocating motion to said pistonin said cylinder, an annular metallic bellows secured in a fluidtightmanner at one end to the cylinder head and at the other end to the headof said piston so as to 1m leave a space between said bellows and theinner wall of said piston, a viscous liquid filling the whole of theinside of said bellows, inlet and outlet valves provided in the cylinderchamber, inlet and outlet pipes connected with said inlet and' metallicbellows secured in a fluidtight manner at the upper end to the cylinderhead, and at the lower end to the bottom of said piston so as to leave aspace between said bellows and the inner cylindrical wall of the piston,a viscous liquid filling the whole of the inside of the bellows, inletand outlet valve provided in the bottom of said cylinder, inlet andoutlet pipes connected with said inlet and outlet valves respectively,the cylinder being provided with a hole extending throughout itscylindrical wall and located in the vicinity of the upper end of saidcylinder so that said hole is always in communication with the spacebetween the outer face of said bellows and the inner cylindrical wall ofthe piston, and a conduit permanently connecting said hole with saidinlet pipe.

AUGUSTE ALBERT HONORE TISSERANT.

